title: Effect of housing systems on the bacterial flora of the air.
mesh_terms: D000391:Air Microbiology; D000818:Animals; D001419:Bacteria / Q000145:classification / Q000302:isolation & purification*; D002645:Chickens; D005260:Female; D006799:Housing, Animal / Q000592:standards; D010058:Oviposition; D012680:Sensitivity and Specificity